Removal of Four Way Valve
Si00-771
18
Removal Procedure
5
Remove the sheets of
putty.
Warning
Be careful not to get yourself
burnt with the pipes and other
parts that are heated by the
gas brazing machine.
Warning
If the refrigerant gas leaks
during work, ventilate the
room. (If the refrigerant gas is
exposed to flames, toxic gas
may be generated.)
Caution
From the viewpoint of global
environment protection, do
not discharge the refrigerant
gas in the atmosphere. Make
sure to collect all the
refrigerant gas.
Cautions for restoration
1. Restore the piping by non-
oxidation brazing.
2. It is required to prevent the
carbonization of the oil inside
the four way valve and the
deterioration of the gaskets
affected by heat. (Keep
below 120°C.) For the sake
of this, wrap the four way
valve with wet cloth and
provide water so that the
cloth does not dry.
In case of difficulty with gas
brazing machine
1. Disconnect the brazed part
where is easy to disconnect
and restore.
2. Cut pipes on the main unit
with a tube cutter in order to
make it easy to disconnect.
Before working, make
sure that the refrigerant
gas is empty in the circuit.
Be sure to apply nitrogen
replacement when
heating up the brazed
part.
6
Heat up the brazed part
and withdraw the piping
with pliers.
Note:
Never use a metal
saw to cut pipes
because the
sawdust may enter
the circuit.
When withdrawing
the pipes, be careful
not to pinch them
firmly with pliers.
The pipes may get
deformed.
Provide a protective
sheet or a steel
plate so that the
brazing flame
cannot influence
peripheries.
Step
Procedure
Points
(R7248)
Four way valve
(R7249)
(R7250)
